Calorimetric measurement of absolute terahertz power at the sub-microwatt level.
Opt Lett
; 39(6): 1609-12, 2014 Mar 15.
Article
en En
| MEDLINE
| ID: mdl-24690850
ABSTRACT
We developed a calorimeter for determining absolute terahertz (THz) power. The calorimeter is based on a DC substitution method using an isothermal temperature-control technique. A neutral-density optical filter glass was used as a volume absorber, and its THz absorption was evaluated by a time-domain spectrometer. Highly sensitive measurement of the absolute THz power was experimentally achieved in the range from the submicrowatt to microwatt level at room temperature. Power measurement of a continuous-wave THz source using a photomixer was demonstrated. This calorimeter is expected to demonstrate the traceability of THz power at a submicrowatt level.
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Opt Lett
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2014
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Article